最近，一应用从oracle数据库向postgresql迁移完成后，启动应用后，应用日志提示报错：

[2021-10-08 17:02:52] ERROR context.ContextLoader - Context initialization failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [ applicationContext.xml]

java.util.MissingResourceException: Can't find resource for bundle java.util.PropertyResourceBundle, key postgresIsPool

看日志提示，applicationContext.xml中无数据源dataSource引用的postgresIsPool相关的key和value键值对。

      查看applicationContext.xml配置如下：

<bean id="propertyConfigurer"

class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

<property name="locations">

<list>

<value>classpath:/parameter.properties</value>

<value>classpath:/stat.properties</value>

                                <!--value>classpath:/jdbc.properties</value>-->

<value>classpath:/cams.properties</value>

<value>classpath:/sso.properties</value>

</list>

</property>

<property name="ignoreUnresolvablePlaceholders" value="true" />

</bean>

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"

destroy-method="close">

<property name="driverClassName">

<value>${jdbc.driverClassName}</value>

</property>

<property name="url">

<value>${jdbc.url}</value>

</property>

<property name="username">

<value>${jdbc.username}</value>

</property>

<property name="password">

<value>${jdbc.password}</value>

</property>

</bean>

看配置文件，项目的数据源配置文件 applicationContext.xml引用了同目录的 parameter.properties参数文件，进一步查看

parameter.properties参数文件，里边只有类似如下oracle相关的配置并无postgresql的配置：

db = oracle

oracleDriver = oracle.jdbc.driver.OracleDriver

oracleUrl = jdbc:oracle:thin:@x.x.x.x:1921/orcl

oracleUser = xxxxxx

oraclePassword = xxxxxxxxx

oracleIsPool = c3p0

oraclePoolName = java:comp/env/jdbc/fsm

oracleType = oracle

根据上述oracle数据源参数配置编辑postgresql相关配置如下所示：

db = postgresql

postgresqlDriver = org.postgresql.Driver

postgresqlUrl = jdbc:postgresql://x.x.x.x:5432/orcl

postgresqlUser = xxxxxx

postgresqlPassword = xxxxxxxxx

postgresqlIsPool = c3p0

postgresqlPoolName = java:comp/env/jdbc/fsm

postgresqlType = postgresql

    修改完配置之后，java应用程序正常连接到postgresql数据库。